/// <summary>
/// Returns the structure handle for a particular tag
/// </summary>
/// <param name="tagName">Name of the tag</param>
/// <returns>Structure handle or 0 if the tag wasn't found...</returns>
internal ushort GetStructureHandle(string tagName)
{
bool refreshed = false;
//lock (_lockObject)
{
//First we find the tag information..
if (_tagInfo == null)
{
RefreshInternalInfo();
refreshed = true;
}
LogixTagInfo ti = GetTagInfo(tagName);
if (ti == null && !refreshed)
{
RefreshInternalInfo();
ti = GetTagInfo(tagName);
}
if (ti == null)
{
return(0);
}
else
{
return((ushort)(ti.FullTypeInfo & 0x7FFF));
}
}
}
/// <summary>
/// Get information about a tag
/// </summary>
/// <param name="Address">Address of the tag</param>
/// <returns>LogixTagInfo object or null if the tag was not found</returns>
public LogixTagInfo GetTagInformation(string Address)
{
List <LogixTagInfo> tagInfo = EnumerateTags();
if (tagInfo != null && tagInfo.Count > 0)
{
LogixTagInfo retTag = tagInfo.Find(t => (string.Compare(t.TagName, Address, true) == 0));
if (retTag == null)
{
return(null);
}
if (retTag.TagName != Address)
{
return(null);
}
return(retTag);
}
return(null);
}
/// <summary>
/// Gets information for the specified tag
/// </summary>
/// <param name="tagName">Name of the tag</param>
/// <returns>LogixTagInfo or null if not found</returns>
internal LogixTagInfo GetInfoForTag(string tagName)
{
bool refreshed = false;
//lock (_lockObject)
{
//First we find the tag information..
if (_tagInfo == null)
{
RefreshInternalInfo();
refreshed = true;
}
LogixTagInfo ti = GetTagInfo(tagName);
if (ti == null && !refreshed)
{
RefreshInternalInfo();
ti = GetTagInfo(tagName);
}
return(ti);
}
}
private List <LogixTagInfo> DecodeTagInfo(byte[] data, out uint lastOffset)
{
List <LogixTagInfo> retVal = new List <LogixTagInfo>();
lastOffset = 0;
for (int i = 0; i < data.Length; i++)
{
LogixTagInfo info = new LogixTagInfo();
lastOffset = BitConverter.ToUInt32(data, i);
i += 4;
info.MemoryAddress = lastOffset;
//Next two bytes are type code and dimension information
ushort typeInfo = BitConverter.ToUInt16(data, i);
i += 2;
info.FullTypeInfo = typeInfo;
//Need to decode the type info...
info.DataType = (ushort)(typeInfo & 0x00FF);
if ((ushort)(typeInfo & 0x8000) == 0x8000)
{
info.DataType = (ushort)(info.DataType | 0x8000);
}
int dimInfo = (typeInfo & 0x6000) >> 13;
info.Dimensions = (ushort)dimInfo;
//Skip 2 bytes
i += 2;
if (i > data.Length)
{
continue;
}
//Next 3 sets of 4 bytes are the dimension sizes
info.Dimension1Size = BitConverter.ToUInt32(data, i);
i += 4;
if (i > data.Length)
{
continue;
}
info.Dimension2Size = BitConverter.ToUInt32(data, i);
i += 4;
if (i > data.Length)
{
continue;
}
info.Dimension3Size = BitConverter.ToUInt32(data, i);
i += 4;
if (i > data.Length)
{
continue;
}
//Next 2 bytes are the length of the name...
int strSize = BitConverter.ToUInt16(data, i);
i += 2;
if (i > data.Length)
{
continue;
}
if (i + strSize > data.Length)
{
continue;
}
info.TagName = System.Text.ASCIIEncoding.ASCII.GetString(data, i, strSize);
i += strSize - 1;
retVal.Add(info);
}
return(retVal);
}
